No problem. I don't really know what the difference is, but I got the idea that it checks for the way you're using markup, but that sounds a bit complicated, so I think I may have it wrong
The imediate differences is that both URL and file upload are avalable on the same page.
Also "advanced option" are only available on the "Extended Interface" page (presumably to cause less confuion among beginners of what they have to do to validate their pages).
Also there is a new option called "Validate error pages".
Not sure what it's supposed to do though
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